/*
 * Copyright (c) JForum Team
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met:
 * 
 * 1) Redistributions of source code must retain the above 
 * copyright notice, this list of conditions and the 
 * following  disclaimer.
 * 2)  Redistributions in binary form must reproduce the 
 * above copyright notice, this list of conditions and 
 * the following disclaimer in the documentation and/or 
 * other materials provided with the distribution.
 * 3) Neither the name of "Rafael Steil" nor 
 * the names of its contributors may be used to endorse 
 * or promote products derived from this software without 
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT 
 * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, 
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
 * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 
 * IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
 * 
 * Created on 25/07/2007 19:27:48
 * 
 * The JForum Project
 * http://www.jforum.net
 */
package net.jforum.search;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import net.jforum.entities.Forum;
import net.jforum.entities.Topic;
import net.jforum.repository.ForumRepository;
import net.jforum.repository.TopicRepository;

/**
 * @author Rafael Steil
 * @version $Id: SearchOperation.java,v 1.5 2007/07/30 14:06:44 rafaelsteil Exp
 *          $
 */
public abstract class SearchOperation {
    public abstract SearchResult performSearch(SearchArgs args);

    public abstract int totalRecords();

    public abstract void prepareForDisplay();

    public abstract List results();

    public abstract String viewTemplate();

    protected abstract int extractForumId(Object value);

    protected abstract int extractTopicId(Object value);

    public final List filterResults(List results) {
	List l = new ArrayList();

	Map forums = new HashMap();
	Map topics = new HashMap();

	for (Iterator iter = results.iterator(); iter.hasNext();) {
	    Object currentObject = iter.next();

	    Integer forumId = new Integer(this.extractForumId(currentObject));
	    ForumFilterResult status = (ForumFilterResult) forums.get(forumId);

	    if (status == null) {
		Forum f = ForumRepository.getForum(forumId.intValue());
		status = new ForumFilterResult(f);
		forums.put(forumId, status);
	    }

	    if (status.isValid()) {
		// TODO: decouple
		if (currentObject instanceof SearchPost) {
		    ((SearchPost) currentObject).setForum(status.getForum());
		}
	    }
	    Integer topicId = new Integer(this.extractTopicId(currentObject));
	    TopicFilterResult status2 = (TopicFilterResult) topics.get(topicId);
	    if (status2 == null) {
		Topic f = TopicRepository.getTopic(topicId.intValue());
		status2 = new TopicFilterResult(f);
		topics.put(topicId, status2);
	    }

	    if (status2.isValid()) {
		// TODO: decouple
		if (currentObject instanceof SearchPost) {
		    ((SearchPost) currentObject).setTopic(status2.getTopic());
		}

	    }

	    if (status2.isValid() || status.isValid()) {

		l.add(currentObject);
	    }

	}

	return l;
    }

    private static class ForumFilterResult {
	private Forum forum;

	public ForumFilterResult(Forum forum) {
	    this.forum = forum;
	}

	public Forum getForum() {
	    return this.forum;
	}

	public boolean isValid() {
	    return this.forum != null;
	}
    }

    private static class TopicFilterResult {
	private Topic topic;

	public TopicFilterResult(Topic topic) {
	    this.topic = topic;
	}

	public Topic getTopic() {
	    return this.topic;
	}

	public boolean isValid() {
	    return this.topic != null;
	}
    }
}
